The movie begins with Dracula reminiscing about his daughter Mavis and her childhood. The scene then shifts to the present, where it's the 125th anniversary of Hotel Transylvania, and all the monsters are gathering to celebrate. However, Dracula's plans to retire and hand over the hotel to his son-in-law Johnny are put on hold when he learns that Johnny is not qualified to run the hotel due to a law that prohibits humans from owning monster properties.
Johnny, determined to prove himself, teams up with Van Helsing to find a machine that can turn humans into monsters. However, the machine malfunctions, and Johnny is transformed into a dragon-like creature. Dracula tries to reverse the transformation but ends up turning himself into a human instead.
The two embark on a journey to find a crystal that can reverse the effects, accompanied by Mavis and the other monsters. Along the way, they face various obstacles, and Johnny's transformation worsens, causing him to lose control.
In the end, Dracula finds the crystal and uses it to reverse the effects, turning Johnny back into a human. The monsters, who had also been transformed into humans, return to their normal state. The hotel, which was destroyed by a mutated guinea pig, is rebuilt, and a year later, it reopens with new implementations. The movie ends with the monsters celebrating the grand reopening of Hotel Transylvania.
Here are the key facts from the text:
1. The film starts with a flashback of Mavis as a child, singing with her father, Dracula.
2. The scene then shifts to the present, where it's the 125th anniversary of the Hotel Transylvania.
3. Dracula's wife, Erika, is mentioned, but she is not present at the party.
4. Johnny is revealed to be planning to take over the hotel after Dracula's retirement.
5. However, Dracula changes his mind and decides not to retire after imagining Johnny running the hotel.
6. Dracula tells Johnny that there is a law that prohibits humans from owning monster properties.
7. Dracula plans to expand the hotel, but Mavis is disappointed that this was not the real announcement.
8. Johnny meets with Van Helsing to discuss a machine that can turn humans into monsters.
9. The machine is tested on a guinea pig, which transforms into a monster.
10. Johnny is transformed into a dragon-like creature after being zapped by the machine.
11. Dracula is transformed into a human after being zapped by the machine.
12. Dracula and Johnny go on a trip to South America to find a crystal to reverse the effects of the machine.
13. The group encounters various obstacles, including a plane crash and a jungle trek.
14. Mavis and the other monsters arrive in South America to help Dracula and Johnny.
15. The group discovers that the crystal is located in a cave with underwater volcanoes.
16. Johnny loses control and mutates into a giant monster.
17. Dracula finds the crystal and uses it to reverse the effects of the machine.
18. Johnny returns to normal, and the machine works on him again.
19. The monsters return to normal, and Dracula gives them the key to rebuild the hotel.
20. The hotel is rebuilt, and the film ends with its grand reopening.